Guy bazeley fetter



Filed May 21, 1923 G y DOJ-LLEY Petite! Patented May 19, 1925.

UNITED STATES GUY BAZELEY PETTER, OF IPSWICH, ENGLAND.

CALCULATING MACHINE.

Application filed May 21, 1923.

To all 10/10 112 it may concern.

Be it known that I, (irUY Bnznnnr Pnr'rnn, of \Vesterfield House, Ipswich, in the county ofSui'l'olk, England, a subject of the King 5 of Great Britain and Ireland, have invented certain new and useful Improvements in or Relating to Calculating Machines, of which the following is a specification.

This invention relates to addition machines of the multiple bank type with a series of ordinal keys in each bank, and has for its object the provision of a simple and eiiicient actuating lever, enabling an improved construction of a machine of this type in which the number of parts .is considerably reduced with corresponding easier manipulation and lower cost of" manutacture.

The following description is applicable to calculations in the decimal system, but the principle of the machine may be applied to other systems of notation.

According to this invention, I provide particularly for use in connection with. cal- 25 culating or adding machines of the type described, a row of figure carrying elements, such as wheels, provided respectively with toothed wheels adapted to be engaged respectively by segmental racks, on key-actu- 3 Med rocking levers, each of which is a compound lever, that is, made of two parts the one slidahle on the other to an extent depending on the particular key which is depressed, and adapted, on depressing any one key either of one compound lever or of several. simultaneously, to engage and rotate the respective figure wheel or wheels by a corresponding amount and to disengage the said figurewheels automatically on being allowed to return to the inoperative position.

,l-le'lerring to the drawings filed herewith, which illustrate (liagrauunatically one particular manner of carrying out this inventionfi Fig. 1 shows one unit of a machine made according to this invention. p In Fig. 1, 6' is the figure wheel on which the figures O, 1, 2 to 9 are marked. This iigi' re wheel is covered by a fixed plate (not shown) with a hole or window in it through which one figure can be seen. The figure wheels are mounted on a' spindle 28 held in hearings in the frame 32 of the machine. Each figure wheel is free to rotate on the spindle, but adjoining wheels are preferably Serial No. 6%,580.

separated by intermediate fixed collars, so as to prevent the movement of one wheel from being affected by friction with intermediate hearings or adjoining wheels. Each figure wheel carries a toothed wheel with ten or any suitable number of teeth. A segment member 7, under control of the key-board, engages the teeth of the figure wheels when the rocking lever is depressed, but is caused to disengage automatically when the lever rises or returns to its original. position. This effect is obtained by means of a suitable longitudinal movement of the member 7 such as a sliding or equivalent motion; the said member being held in sliding contact with the lever 8 by means of two guides 9 and 10. The lever 8 is mounted on a spindle 13 held in bearings inthe frame of the machine.

The compound lever 7-8 is held in the inoperative position by means of'a spring 11, and a stop 12 fixed in the frame of the machine. A row offive keys 1, 2, 3, 4, 5, is arranged on the key-board and the depres sion of a single key causes the figure wheels to move through a corresponding number of steps or divisions. I

For numbers between 5 and 10, successive depressions of suitable keys are made. For example, the successive depression of keys 5 and 4; will move the figure wheel through nine divisions, but the full requisite number of keys, for example 9 in the decimal system, may be provided.

Locating teeth or rollers 18 controlled by springs or in any suitable manner may be employed as is usual in machines of this type and suitable ratchet devices not shown in drawing may be employed to prevent ro tation of the numeral wheels in the wrong direction.

To illustrate the working of the machine, let it be supposed that the key is depressed.

The downward movement of the member 7 brings the segmental rack thereon into engagement with the teeth of the figure wheel 6'which latter is caused to rotate. At the same time, the member 7 is caused by pressure of the teeth of the figure wheel to slide along below the lever 8, until the stop 14 comes into contact with the end 8 of the lever 8, this being its maximum displacement. On releasing the key 5, the levers 7 and 8 are raised by means of the spring 11 and the segmental rack comes out of engagement with the figure wheel 6, without any lllll tendency to move the latter in the reverse direction. The reverse side 15 of the segmental rack now comes into contact with the stop 12, thereby causing themember T to slide out into its original position.

Keys 1, 2, 3, 4, attached to lever 55, have a small vertical movement on the lever by means of pins 16 on the lever, working in slots 16 on the keys, and spring 17. The pins may be so shaped as to act as guides for the keys, or any other arrangement may be used for the purpose. Other methods of providing this spring-controlled movement are available. Corresponding differential stops 7 are tired in the inenil'ier 7. Normally, the keys are held up by the springs l2, so as tobe c ear of the stops 7, and allow the sliding movement of the member T to take place, but the key when depressed comes into such a position that itengages with its corresponding stop whereby the movement; of the levers and figure wheels is limited to the required amount, according to the particular key which s depre ed.

In the foregoing description I have set forth by way of illustration one method o't carrying out my invention, but I wish to make it clear that certain entirely novel principles are embodied therein and the method oi": putting them into effect is subject to considerable modification.

The invention comprises, for example, any combination of rocking levers with segmental levers adapted to slide longitudinally or to receive an equivalent motion. Furthermore, the machine may be provided with suitable locking devices, ratchcts. etc, as are customary in such machines for the purpose of preventing involuntary movement of the parts.

What I claim and desire to secure by Lettcrs Patent is 1. In calculating machines of the multibank type, a series of ordinal keys in each bank, a row of pivoted figure carrying element-s, teeth on said figure carrying elements, and means actuated by said keys, said means engaging said teeth on the movement of said keys in the operative direction and disengaging them in the other direction of movement, said means comprising lever mechanisms carrying engaging elenients adapted to engage said teeth, said lever mechanisms comprising pivoted rocking levers in combination with longitudinal members adapted to move longitudinally of the rocking lever, characterized in that the longitudinal movement takes place automatically during the movement of the levers in the operative direction by reason of the pressure of the teeth on the figure carrying elements against the longitudinal members.

2. In calculating machines, the combination of elements as claimed in claim 1, in

which said longitudinal members are adapted to slide longitudinally of the rocking lever.

In calculating machines, the combination of elements as claimed in claim 1, said longitudinal nembers having a sliding movement, and said engaging elements com prising segmental racks carried by said longitudinal members.

4:. In calculating machines, the combination with the elements as claimed in claim 1,

ot means for moving said longitudinal member predetermined amounts by depressing predetermined keys so as to give the corresponding requisite amount of rotation to the figure carrying elements, said means comprising din crentihl stops on the longitudinal Il'lQllll'lGl', and finger keys on the rocking lever, said keys being movable to enable them severally to engage the said difiiercntial stops.

5. In calculating machines, the combinaion with the elements as claimed in claim 1, said longitudinal members having a sliding movement, and said engaging elements comprising a segmental rack on each sliding member, of means for returning each sliding member to its original position on the re turn movement of the rocking lever.

(3. In calculating machines, the combination with the elements as claimed in claim 1, said longitudinal members having a sliding movement, and said engaging elements comprising a segmental rack on each sliding member, of means for returning each sliding member to its original position on the return movement of the rocking lever, said means comprising an inclined surface on the sliding member, and a fixed abutment engaged by the said inclined surface.

I 7. In calculating machines, the combination with the elements as claimed in claim 1, said longitudinal members having a sliding movement, and said engaging elements comprising a segmental rack on each sliding member, of means for returning the sliding member to its original. position on the return movement ot' the rocking lever, said means comprising an inclined surtace on the sliding member, and a fixed abutment engagedv by the said inclined snrtacc, and means whereby the amount of sliding movementot said member in determined in relation to the particular key depressed so as to give the corresponding requisite amount of rotation to the figure carrying elements, said means comprising differential. stops on the sliding member, and finger keys on the rocking lever, said keys being provided with small spring-controlled movements enabling them severally to engage the said ditl eren tial stops.

In testimony whereof I atliiz my signature.

GUY BAZELEY PETTER.

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